Assessing the position tracking reliability of Carstens' AG500 and AG501 electromagnetic articulographs during constrained movements and speech tasks
Assessing the position tracking reliability of Carstens' AG500 and AG501 electromagnetic articulographs during constrained movements and speech tasks
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DOI：
10.1016/j.specom.2018.10.001
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发表时间：
2018-11-01
影响因子：
3.2
通讯作者：
Grimaldi, Mirko
中科院分区：
文献类型：
--
作者：
Sigona, Francesco;Stella, Massimo;Grimaldi, Mirko
本研究的目的是定性和定量评估AG501电磁关节记录仪(Carstens Medizinelektronik GmbH)的可靠性，并将其与仍广泛用于关节运动3D记录的先前型号AG500进行比较。为了探索和测试音量不同区域中发音轨迹的空间准确性，跟踪和分析了语音产生任务期间受控传感器在固定位置和沿圆形轨迹的位置以及说话人声道发音部件的运动。众所周知，AG500轨迹受到扰动的影响：(I)取决于传感器/对象在录音音量内的位置；(Ii)在同一录音区域中，沿着相同声音的重复随机发生。这项研究表明，这些问题不会影响较新的AG501，它不仅在记录体积内20厘米宽的球形区域内根据制造商声称的0.3 mm动态精度进行性能测试，而且在外部性能也很好。此外，虽然AG500在某些情况下显示了扰动的轨迹，但AG501在再现测试语音任务中辅音和发声手势的位移方面始终显示出准确的结果。我们的研究结果表明，AG501比之前的模型AG500更稳定和更准确，而AG500只有在特定的有限条件下才表现得相当好。
The goal of this study is to qualitatively and quantitatively assess the reliability of the AG501 Electromagnetic Articulograph (Carstens Medizinelektronik GmbH) and to compare it with the previous model, the AG500, which is still widely used in the 3D recording of articulatory movements. To explore and test the spatial accuracy of the articulographs in various areas of the recording volume, controlled sensor positions at fixed locations and along circular trajectories as well as movements of articulators of the speaker's vocal tract during speech production tasks were tracked and analysed.It is well known that the AG500 trajectories are affected by perturbations which: (i) depend on the position of the sensors/subject within the recording volume and (ii) randomly occur along repetitions of the same sound in the same recording area. This study has shown that these issues do not affect the newer AG501, which not only performs according to the manufacturer's claim of 0.3 mm dynamical accuracy within a 20-cm-wide spherical region inside the recording volume, but also performs well outside. Furthermore, while the AG500 shows perturbed trajectories in some instances, the AG501 consistently shows accurate results in reproducing the displacements of consonantal and vocalic gestures for the tested speech tasks.Our findings reveal that the AG501 is more stable and significantly more accurate than the previous model, the AG500, which, in turn, performs reasonably well only in specific limited conditions.